Jake Paul has lashed out at rival Tommy Fury, branding him "boxing’s biggest b****" after he pulled out of a fight due to a medical condition.
Love Island star Fury, 22, withdrew from the fight after suffering "a severe chest infection and broken rib", revealing he was "heartbroken".
Fury’s promoter, Frank Warren, said he was "clearly not anywhere near 100%".
But Paul, 24, criticised Fury’s decision to pull out in a video posted on Twitter on Monday afternoon.
The boxer launched a scathing attack, telling his four million followers: "It is official, Tommy Fury is boxing biggest b****.
"He has pulled out of the fight, the Furys have pulled out of the fight due to a medical condition."
He added: "I couldn’t believe the news at first, it still doesn’t even seem real.
"Now he will be watching at home, paying me $60, instead of getting paid millions of dollars to fight me.
"I’ve fought with a broken nose, I’ve fought sick, get the f*** over it, this is boxing.
"It’s official, he was scared, I think the pressure got to him, the s*** talk got to him."
Now Paul will have a rematch with Tyron Woodley on 18 December in Tampa Bay, Florida.
Paul has offered Woodley $500,000 extra if he can knock him out.
He added: "The good news is that Mr Tyron Woodley, we called him up, we were like, ‘hey do you want to take the fight’, he has been training, he goes ‘sure I’ll take the fight, let’s do the rematch, run it back’."
"I’m giving him $500,000 extra if he can knock me out.
He added: "I didn’t knock him out the first time, I’m coming back.
"Sunday 18th, the show must go on, I’ll see you guys there."
Fury previously warned Paul on 14 November how "NOTHING can save you now" and "you’ll see that you can’t come into my world and not get hurt", in a tweet accompanied with a clown emoji.
Today he said in a statement: "I am absolutely heartbroken that I have been forced to withdraw from my fight with Jake Paul.
"I can’t express how disappointed I am and I really do hope we can get this fight rescheduled in the New Year, I want this fight to still happen more than anything.
"I’m now regretfully putting my focus on recovery and a further reschedule date."
Once a popular content creator on YouTube, Paul quit social media to trade blows in the ring and is undefeated in his four professional fights.
Fury, younger brother of WBC heavyweight champion, Tyson Fury, 33, has won each of his seven matches.